Defeat Sergeant Brock, obtain the storage key, and search inside. Slin may have been here.
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Quest Steps - Open the Contraband Storage
Journal
I remember now. Someone vanished in a strange flash of light inside Tristan's empty office. An illegal trade ledger was left behind. Was it planted there deliberately? Who did it?
The day I uncovered Tristan's secret ledger, Slin threatened me with his sword. It seems he still assists in Tristan's illegal dealings.